Vibrating screen



March 2, 1943. M. LINTZ VIBRATING SCREEN Filed Feb. l, 1941 INVENTOR.MAR/1' L m/Tz Y g v I M S2 ATTORNEYS,

Patented Mar. 2, 1943 UNITED STATES QlifE- lQLE vmaarnye Mark Linta, SanFranciscogGalifa ileat Feb r 1, meta male 6 Claims. (01. i299f33 i Thisinvention relates to improvements invit n ee s p r icula ly. he; ype. ofscreen that is useful for separating divided solids,

A certain amount of I vibration greatlyfacilitates the function of ascreen, in that it moves and agitatesthe material. resting upon thescreen, thus facilitating the passage of the fines through the meshes ofthe screen, resu1ting in more rapid and thorough screening action.

Vibration also serves the useful purpose of. breaking up and separatinglumps of material that are, in reality, composed entirely or partiallyof fines.

There is a particular need-for such a vibratory screen that readily maybe operated by hand where power actuated mechanism is notavailable, suchas in assay and researchlaboratories or the like.

Therefore, it is aprincipal object of themesent invention to provide avibratory screen that is. particularly effective in rapid screening ofmaterial;

Another object is ,to provide. such'a screen that readily may beoperated by hand without the use of power-driven mechanism.

A further object is to provide a screen having the aforesaiddesirable;characteristics, that isunusually simple in its componentparts and economical to construct.

Still another objectis to provide suchascreen that is particularlydurable.

Other objects and advantages reside in details of design andconstruction which will be more fullydisclosed in the followingdescription and in the drawing whereinlike partshave been similarlydesignated and in which:

Figure 1 is aplan view of a screen made according to the presentinventive concept;

Figure 2 is a broken elevation partially in section, of the screenillustrated in Figure 1, looking in the direction of arrow 2; and

Figure 3 isa sectional view taken alongthe; line 3-.-3'of Figure 2,withthe screen element. removed.

In. order to disclosean operative reductionto practice of the presentinvention, theaccompfinying drawing, which is made a parthereof, will bedescribed in some particularity. However, the present'disclosure ismerely a typical example and it shouldnot be construed to express or toimply any limitation to the invention, thescope of which is, in reality,measured by;theappended-claims.

While screens made according to the present inventive concept can bemadein different sizes for different purposes, the ,presentexample is ascreen that is well suited for manual operation in a min: ingresearch orassay laboratory where divided solids, such as ore, minerals or the likeare frequently screened.

In the drawing, reference character 5 denotes a steel plate havingdownwardly and inwardly turned edges 6 and I. Mounted upon-the uppersurfa eo t e=p at;.e..5 are pluralitynfresilie t ac etsfi-whi hi resferthenurhoseof m ah y ece v n -a d h ldi a circ arsc een e em t which is.provided withwire mesh 1H1: of suitab SlZe.

Carri d. b neath, the. plate 5 is. an. octa onal roller l 2having-trunnions-lt that are retained'by: e d w d y... andrinwardly tuned edges t. an

Annular-grooves .H.-.and l5.- are. cutzor othe w produced in the roller;l2, theqbotto .of said rooves bein cylinder somewhat. comparable sizeandshape'to the trll lgnicnslB;

Cylindrical guide .rods 16. .andli: are; welded or otherwise attached-.to theybottbmof the plate 5'in a position toengage annular.grooyesldand I5 respectively.

Stop nd cated-by reference character- 18' may eprovidedrat opposite endsof theiinturned p tionslof edgesfi and lto pr.event.;thetrunnionsl3frommoving y ndcertainii 'tswithreference to the. plate 5.. These stops.ltsmay. b made bywelding or otherwise attaching. angle-vv bracketswithin. the iinturned edges .6 and .1, .or they. may be fashioned. bypartially, cutting a portion. of the downwardly turned edges-.6; and iiarid-bending; the tongue thus formed inwardly,,a's.indicated'at. L9.

The extreme, opposite. endsof: the downwardly turned edges 6': and .1preferably are .beveled up! wardly. as at 20;. a

Iniuse, the removable-.screen. element.9 is placed upon the. plate 5.whereitisLheldby resilient brackets. '8, and. the-material to.be:..screenedr is. placed :1therein. The-operator then graspseither thescreen itself or. the. edges of s'the. plate5tand rolls the platefromleft-tdrightandfrom rightto left;upon the. -octagona1:.:roller l2;which .move ment obviously transmits. sharp. vibratory; im-v pulses tothe plate. andtothe screen element 9.

It will be manifest that the roller [2 is supported upon any. convenientflat surface, suchasa bench top or the like. Tofacilitatefurtherthescreening action, the entire plateand. screen assembly may be.rocked about the axisof the roller somewhat: from the horizontal:position illustrated.

Thus is provided several components of movement and force, in that the.materialis rocked, shifted from right to left and. from left to right,and sharply vibrated with an up ,and down-component which isimpartedby'the irregular shape of the roller l2.

While an 8-sided or octagonalroller l2 hasbeen found to. give excellentresults, it .will bemanifest, that rollers of other types. may be.successfully used, the,primaryiconsideration.being to. provide a r llerthat. ha i r ular. or n n-c rcular peripheral contour.

It has been found that a roller having less than eight sides is inclinedto slide instead of forth herein that screens made according to thepresent inventive concept are particularly well adapted for manualoperation; however, it might be that, under some circumstances, a screenmade according to this disclosure might be actuated by power in order tosave labor and take advantage of the excellent screening characteristicsof the various components of movement herein provided for.

The relationship of the roller I2 to the plate 5 may be such that theroller [2- is out of contact with the lower surface of the plate 5, bywhich arrangement the vibratory impulses would be produced by the bottomof the roller passing over a smooth surface, which vibrations would betransmitted to the plate through cylindrical guide rods [6 and I! ortheir equivalents.

On the other hand, the guide rods l6 and I! may be of such a verticalcross sectional dimension that the vertices of the angular sides of theexterior of roller l2 come into actual contact with the undersurface ofthe plate 5, by which arrangement vibratory impulses would be producedboth by the roller passing over a supporting surface and also by theroller contacting the under-surface of the plate 5.

Obviously, the vibratory impulses are generated by the vertices of theangles formed by adjacent sides of the roller l2. These vertices areradially extending projections which might be provided in numerousdifferent forms such as a roller having flutes, ribs, or lobes, or aroller of star-shaped cross section, or a mere hub having radiallyprojecting arms or spokes, or a roller having the cross section of apolygon of any desired number of sides.

Any of the above-named forms of roller can be made symmetrical orunsymmetrical and there appears to be no geometric term or accepteddefinition that is generic to so great a variety of these equivalentforms. Therefore, in the fol lowing claims, the terms non-cyclindricaland non-circular are intended to be generic to all types of rollershaving a plurality of radially extending projections circumferentiallyspaced about their perimenters and arranged either sym-' metrically orunsymmetrically.

What I claim and desire to secure by Letters Patent is:

1. A device of the character disclosed comprising a free-floatingnon-cylindrical roller having trunnions and having two annular groovespositioned intermediate the trunnions, a plate carried upon the rollerand having downwardly and inwardly turned edges positioned to embracethe trunnions, said downwardly and inwardly turned edges forming,together with the bottom of the plate, elongated channels of greaterwidth than the diameter of the trunnions through which the journals ofthe roller may travel, said edges being beveled upwardly at oppositeends, guide means on the plate positioned to engage the grooves in theroller, a screen element carried upon the plate, and resilient bracketson the plate in a position to hold the screen removably, the surface ofthe roller projecting downwardly beyond the inwardly turned edges so asto engage a supporting surface.

2. A device of the character described, comprising a body member havingmeans for the support of a screen on its top surface, a noncylindricalroller loosely journaled on the body for rotary movement lengthwisealong the same, and means for communicating vibratory movement of theroller to the screen through the intermediary of the body member, thesurface of the roller projecting downwardLv beyond the body member so asto engage a supporting surface in its rotary movement lengthwise of thebody.

3. A device of the character described, comprising a body member havingmeans for the support of a screen on its top surface, an octagonalroller loosely journaled on the body for rotary movement lengthwisealong the same, and means for communicating vibratory movement of theroller to the screen through the intermediary of the body member, thesurface of the roller projecting downwardly beyond the body member so asto engage a supporting surface in its rotary movement lengthwise of thebody.

4. A device of the character described, comprising a body member havingmeans for the support of a screen on its top surface, guide means on theunder surface of the body extending throughout a substantial portion ofits length, a non-cylindrical roller supported in the guide means foroscillatory movement therealong and having a surface projectingdownwardly beyond the body member so as to engage a supporting surfacein its rotation, and means for communicating vibratory movement of theroller to the screen through the intermediary of the body member.

5. A device of the character described, comprising a body member havingmeans for the support of a screen on its top surface, guide means on theunder surface of the body extending throughout a substantial portion ofits length, a non-cylindrical roller supportedin the guide means foroscillatory movement therealong and having a surface projectingdownwardly beyond the body member so as to engage a supporting surfacein its rotation, and means associated with the roller for communicatingvibratory movement of the roller to the screen throughout the range ofits movement in said guide means.

6. A device of the character described, comprising a body member havingmeans for the support of a screen on its top surface, guide means on theunder surface of the body extending throughout a substantial portion ofits length, a non-cylindrical roller supported in the guide means foroscillatory movement therealong and having a surface projectingdownwardly beyond the body member so as to engage a supporting surfacein its rotation, and means associated with the roller for communicatingvibratory movement of the roller to the screen throughout the range ofits movement in said guide means, the body at each end of the guidemeans having its under surface beveled to facilitate tilting about theaxis of rotation of said roller.

MARK LINTZ.

